Discussion
The results are not depending on the sensitivity of the observer alone, but also on the decision criteria used by the subject. This is a key assumption of ........ method/model.
Answer: D
This is the key assumption of the signal detection method.
Signal detection theory separates two things that classical psychophysics merged: the observer's sensitivity to the signal (d') and the decision criterion (beta) the observer adopts about when to say 'yes'. A cautious observer and a liberal one with the same sensitivity will produce different hit and false-alarm rates, so the results depend on both.
The fast-guess and deadline models deal with the speed-accuracy trade-off in reaction time tasks. The method of (average) error is the classical method of adjustment for measuring thresholds, which assumes no separate decision criterion.
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